Wilhelm of Habsburg, Archduke of Austria, was originally engaged to Hedwig of Anjou, future king of Poland. Then when Hedwig's became heiress to Poland, Wilhelm was rejected and Jogaila/Wladyslaw II, Grand Duke of Lithuania chosen instead. Wilhelm married Hedwig's cousin, Princess Giovanna of Naples (later Queen Giovanna II), but they had no kids.
Now for the WI: Giovanna was of spinster age when she wed (25-27yo according to various sources), not PAST the time of women (her brother was born when their mom was 29/30yo) but certainly older than usual. So, what if Giovanna manages one or two kids?
Giovanna II, Queen of Naples (b.1373) m: 1401 Wilhelm, Archduke of Austria, Duke of Styria and Carinthia (b.1370)
• Friedrich, Archduke of Austria, Duke of Calabria (b.1402)
• Margarethe, Archduchess of Austria (b.1405)